linux-kernel - Re: [PATCH 31/42] x86, efi: Copy SETUP

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Date:	Fri, 24 Jul 2015 10:07:48 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Kees Cook <keescook@...omium.org>,
	"H. Peter Anvin" <hpa@...or.com>, Baoquan He <bhe@...hat.com>,
	linux-kernel@...r.kernel.org,
	Matt Fleming <matt.fleming@...el.com>,
	linux-efi@...r.kernel.org
Subject: Re: [PATCH 31/42] x86, efi: Copy SETUP_EFI data and access directly

Hi,

On 07/07/15 at 01:20pm, Yinghai Lu wrote:
> The copy will be in __initdata, and it is small.
> 
> We can use pointer to access the setup_data instead of using early_memmap
> everywhere.

Looks good to me except one issue about missing checking memremap return value.
see the comment inline

> 
> Cc: Matt Fleming <matt.fleming@...el.com>
> Cc: linux-efi@...r.kernel.org
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---

[snip]

> --- a/arch/x86/platform/efi/efi_64.c
> +++ b/arch/x86/platform/efi/efi_64.c
> @@ -295,9 +295,17 @@ void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
>  	return (void __iomem *)__va(phys_addr);
>  }
>  
> +static struct efi_setup_data efi_setup_data __initdata;
> +
>  void __init parse_efi_setup(u64 phys_addr, u32 data_len)
>  {
> -	efi_setup = phys_addr + sizeof(struct setup_data);
> +	struct efi_setup_data *data;
> +
> +	data = early_memremap(phys_addr + sizeof(struct setup_data),
> +			      sizeof(*data));

There should be a checking for return value here..

> +	efi_setup_data = *data;
> +	early_memunmap(data, sizeof(*data));
> +	efi_setup = &efi_setup_data;
>  }
>  

[snip]

Thanks
Dave
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